Question

The common mode of sexual reproduction in Chlamydomonas is

• A. isogamous
• B. anisogamous
• C. oogamous
• D. hologamous.

Answer 1

The Correct Option is A

The question asks about the common mode of sexual reproduction in Chlamydomonas, an important genus of green algae. To answer this, let's explore the types of sexual reproduction:

1. Isogamous: In this mode, the gametes involved in reproduction are morphologically similar. They may differ in physiological aspects, but they look identical.
2. Anisogamous: This involves gametes that are dissimilar in size or form. Typically, one gamete is larger and non-motile while the other is smaller and motile.
3. Oogamous: This form also involves the union of two dissimilar gametes but here, the female gamete (egg) is non-motile and significantly larger than the male gamete (sperm), which is motile.
4. Hologamous: In this rare form of reproduction, the entire individual acts as a gamete.

Chlamydomonas generally reproduces using isogamous reproduction, where both gametes are similar in appearance, but can come from different mating types. This is a characteristic feature observed in many species of green algae.

Therefore, the correct answer is isogamous.

In conclusion, Chlamydomonas primarily exhibits isogamous reproduction, making it distinct for its morphologically similar gametes, even though their origins may vary in other reproductive terms.